001/** 002 * Copyright 2015 DuraSpace, Inc. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.fcrepo.auth.webac; 017 018import static com.hp.hpl.jena.rdf.model.ModelFactory.createDefaultModel; 019import static org.fcrepo.auth.webac.URIConstants.WEBAC_ACCESS_CONTROL_VALUE; 020import static org.slf4j.LoggerFactory.getLogger; 021 022import javax.jcr.Session; 023import javax.ws.rs.core.Link; 024import javax.ws.rs.core.UriInfo; 025 026import org.fcrepo.http.commons.api.UriAwareHttpHeaderFactory; 027import org.fcrepo.http.commons.session.SessionFactory; 028import org.fcrepo.kernel.api.identifiers.IdentifierConverter; 029import org.fcrepo.kernel.api.models.FedoraResource; 030import org.fcrepo.kernel.api.services.NodeService; 031import org.fcrepo.kernel.modeshape.rdf.impl.DefaultIdentifierTranslator; 032import org.fcrepo.kernel.modeshape.rdf.impl.PropertiesRdfContext; 033 034import org.slf4j.Logger; 035 036import com.google.common.collect.ArrayListMultimap; 037import com.google.common.collect.ListMultimap; 038import com.google.common.collect.Multimap; 039import com.hp.hpl.jena.rdf.model.Model; 040import com.hp.hpl.jena.rdf.model.Resource; 041 042import org.springframework.beans.factory.annotation.Autowired; 043import org.springframework.stereotype.Component; 044 045/** 046 * Insert WebAC Link headers to responses 047 * 048 * @author whikloj 049 * @since 2015-10-30 050 */ 051@Component 052public class LinkHeaderProvider implements UriAwareHttpHeaderFactory { 053 054 private static final Logger LOGGER = getLogger(LinkHeaderProvider.class); 055 056 @Autowired 057 private SessionFactory sessionFactory; 058 059 @Autowired 060 private NodeService nodeService; 061 062 @Override 063 public Multimap<String, String> createHttpHeadersForResource(final UriInfo uriInfo, final FedoraResource resource) { 064 065 final Session internalSession = sessionFactory.getInternalSession(); 066 final IdentifierConverter<Resource, FedoraResource> translator = 067 new DefaultIdentifierTranslator(internalSession); 068 final Model model = createDefaultModel(); 069 final ListMultimap<String, String> headers = ArrayListMultimap.create(); 070 071 LOGGER.debug("Adding WebAC Link Header for Resource: {}", resource); 072 073 nodeService.find(internalSession, resource.getPath()).getTriples(translator, PropertiesRdfContext.class) 074 .filter(t -> model.asStatement(t).getPredicate().hasURI(WEBAC_ACCESS_CONTROL_VALUE)) 075 .filter(t -> t.getObject().isURI()) 076 .forEachRemaining(t -> { 077 headers.put("Link", Link.fromUri(uriInfo.getBaseUriBuilder() 078 .path(translator.convert(model.asStatement(t).getObject().asResource()).getPath()) 079 .toString()).rel("acl").build().toString()); 080 }); 081 082 return headers; 083 } 084 085 086}